Level select:
Start a new game and enter !EVAH! as a case-sensitive name. 

Invincibility:
Start a new game and enter B4K42 as a case-sensitive name. The "God mode" 
selection will now be unlocked at the options screen when the game is paused. 

All bonuses:
Start a new game and enter 105770Y2 as a case-sensitive name. Note: The code 
contains the number "zero" and not a capital letter "o". All character biographies, 
vehicle specifications, FMV sequences, and concept artwork will be unlocked. 

Multiple codes:
Start a new game and enter more than one code together to activate each of them 
simultaneously. For example, enter B4K42105770Y2 as a case-sensitive name.